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Ground-glass opacity (GGO) is a finding seen on chest x-ray (radiograph) or computed tomography (CT) imaging of the lungs. It is typically defined as an area of hazy opacification (x-ray) or increased attenuation (CT) due to air displacement by fluid, airway collapse, fibrosis , or a neoplastic process . [ 1 ]
HRCT shows a ground-glass appearance. [20] The major hallmark of DIP is the presence of a large number of macrophages within the alveoli that are distributed throughout the pulmonary acini. These macrophages are rich in eosinophilic cytoplasm and frequently include a coarsely granular light-brown pigment. There are usually a few multinucleated ...
One study showed that reticulation, ground glass opacities, and traction bronchiectasis are the most common CT scan features of antisynthetase syndrome. [40] The presence of organizing pneumonia and non-specific interstitial pneumonia is somewhat common in antisynthetase syndrome.
There may be superimposed CT features such as mild ground-glass opacity, reticular pattern and pulmonary ossification. Probable UIP pattern: [4] Predominantly subpleural and basal; Often heterogenous distribution; Reticular pattern with peripheral traction bronchiectasis or bronchiolectasis; There may be mild ground-glass opacity; Indeterminate ...
Low-dose high-resolution (1.25 mm) chest CT. HRCT is performed using a conventional CT scanner. However, imaging parameters are chosen so as to maximize spatial resolution: [1] a narrow slice width is used (usually 1–2 mm), a high spatial resolution image reconstruction algorithm is used, field of view is minimized, so as to minimize the size of each pixel, and other scan factors (e.g. focal ...
Ground-glass opacity seen on CT caused by hypersensitivity pneumonitis, not flock worker's lung.This type of abnormality is commonly seen in flock worker's lung. Signs and symptoms of flock worker's lung include rales (crackling noises caused by fluid in the lungs), dyspnea (shortness of breath), and coughing.
In A, axial CT scan of the chest showing a right lower lobe pulmonary nodule surrounded by areas of ground-glass opacity (the CT halo sign). In B, axial CT scan of the chest showing multiple, randomly distributed pulmonary nodules surrounded by the CT halo sign; the final diagnosis was aspergillosis. Differential diagnosis: temporal arteritis
CT scans may show characteristic findings such as ground-glass opacities in centrilobular distribution, and mediastinal lymphadenopathy, but these findings are non-specific and may be seen in other conditions.